Daniel Marc Hooper (born 1973), known by the nickname Swampy, is a British environmental activist. He was involved in a number of environmental protests in the 1990s, becoming nationally famous after spending a week in a tunnel aiming to stop the expansion of the A30 in Fairmile, Devon, in 1996. In 2020, he was arrested attempting to stop the destruction of Jones Hill Wood for High Speed 2 (HS2) and then joined a Stop HS2 protest at Euston Square Gardens in London.